Research from Penn and UCSB shows how giant clams harness the sun

The team members began their study hypothesizing that the clams' iridocytes were being used to maximize the usefulness of the light that reaches the algae within their bodies. They were first confounded by the relationship between these iridescent structures and the single-celled plants, until they realized that they had an incomplete picture of their geometry. When they made more precise cross sections of the clams, they found that the algae were organized into pillars, with a layer of iridocytes at the top.

"When we saw the complete picture, we understood that the pillars are oriented exactly the wrong way if you want to catch sunlight," Sweeney said. "That's where the iridocytes come into play."

The team relied on Amanda Holt and Sanaz Vahidinia to model exactly what was happening to the light once it passed through the iridocytes; the degree of disorder within these cells bore a resemblance to structures Vahidinia studies at NASA: the dust of Saturn's rings.

Their analysis suggested that the iridocytes would scatter many wavelengths of light in a cone-like distribution pointing deeper into the clam. Red and blue wavelengths, the most useful to the algae, spread the widest, impacting the sides of the pillars in which the single-celled plants were stacked.

Researchers from the University of Pennsylvania and the University of California, Santa Barbara, have now shown how giant clams use iridescent structures to thrive, operating as exceedingly efficient, living greenhouses that grow symbiotic algae as a source of food. This understanding could have implications for alternative energy research, paving the way for new types of solar panels or bioreactors. Here, we see the structure of the algal pillars (brown) within the clams. Sunlight at the equator is too intense for their algae to be efficient; these pillars are arranged vertically, so the algae do not receive the full brunt of that intensity. A layer of iridocytes (blue) on top of the pillars scatter many wavelengths of light in a cone-like distribution pointing deeper into the clam. Red and blue wavelengths, the most useful to the algae, spread the widest, impacting the sides of the pillars in which the single-celled plants are stacked.

(Photo Credit: Alison Sweeney)

To test this model, the team constructed fiber optic probes with spherical tips the size of an individual alga. Threaded through a section of clam flesh alongside the native algae, this spherical probe was able to detect the angled light scattered by the iridocytes, whereas a flat-tipped probe, only able to sense light shining straight down, detected nothing.

"We see that, at any vertical position within the clam tissue, the light comes in at just about the highest rate at which these algae can make use of photons most efficiently," Sweeney said. "The entire system is scaled so the algae absorb light exactly at the rate where they are happiest."

"This provides a gentle, uniform illumination to the vertical pillars consisting of the millions of symbiotic algae that provide nutrients to their animal host by photosynthesis," said Morse. "The combined effect of the deeper penetration of sunlight — reaching more algae that grow densely in the 3-dimensional volume of tissue — and the "step-down" reduction in light intensity — preventing the inhibition of photosynthesis from excessive irradiation — enables the host to support a much larger population of active algae producing food than possible without the reflective cells."

Mimicking the micron-scale structures within the clam's iridocytes and algal pillars could lead to new approaches for boosting the efficiency of photovoltaic cells without having to precisely engineer structures on the nanoscale. Other alternative energy strategies might adopt lessons from the clams in a more direct way: current bioreactors are inefficient because they must constantly stir the algae to keep them exposed to light as they grow and take up more and more space. Adopting the geometry of the iridocytes and algal pillars within the clams would be a way of circumventing that issue.

"The clam has to make every square inch count when it comes to efficiency," Sweeney said. "Likewise, all of our alternatives are very expensive when it comes to surface area, so it makes sense to try to solve that problem the way evolution has."

Researchers from the University of Pennsylvania and the University of California, Santa Barbara, have now shown how giant clams use iridescent structures to thrive, operating as exceedingly efficient, living greenhouses that grow symbiotic algae as a source of food. This understanding could have implications for alternative energy research, paving the way for new types of solar panels or bioreactors. These structures, known as iridocytes (in detail here), give the clams their spectacular color. Sunlight at the equator is too intense for their algae to be efficient; iridocytes help filter that light.

(Photo Credit: Alison Sweeney)

Researchers from the University of Pennsylvania and the University of California, Santa Barbara, have now shown how giant clams use iridescent structures to thrive, operating as exceedingly efficient, living greenhouses that grow symbiotic algae as a source of food. This understanding could have implications for alternative energy research, paving the way for new types of solar panels or bioreactors. These structures, known as iridocytes, give the clams their spectacular color. Sunlight at the equator is too intense for their algae to be efficient; iridocytes help filter that light.

(Photo Credit: Alison Sweeney)

Source: University of Pennsylvania